irq.h

fairysky系统,是一个小型的内核,模拟linux原始版本的

/*文件名: irq.h
  说明:   
  作者:   marsinfan
  日期:   2005/12/07
*/

#ifndef _ASM_IRQ_H
#define _ASM_IRQ_H

/*
 *  linux/include/asm/irq.h
 *
 *  (C) 1992 Linus Torvalds
 */

#define SAVE_ALL \
    "cld\n\t" \
    "push %gs\n\t" \
    "push %fs\n\t" \
    "push %es\n\t" \
    "push %ds\n\t" \
    "pushl %eax\n\t" \
    "pushl %ebp\n\t" \
    "pushl %edi\n\t" \
    "pushl %esi\n\t" \
    "pushl %edx\n\t" \
    "pushl %ecx\n\t" \
    "pushl %ebx\n\t" \
    "movl $0x10,%edx\n\t" \
    "mov %dx,%ds\n\t" \
    "mov %dx,%es\n\t" \
    "movl $0x17,%edx\n\t" \
    "mov %dx,%fs\n\t"

/*
 * SAVE_MOST/RESTORE_MOST is used for the faster version of IRQ handlers,
 * installed by using the SA_INTERRUPT flag. These kinds of IRQ's don't
 * call the routines that do signal handling etc on return, and can have
 * more relaxed register-saving etc. They are also atomic, and are thus
 * suited for small, fast interrupts like the serial lines or the harddisk
 * drivers, which don't actually need signal handling etc.
 *
 * Also note that we actually save only those registers that are used in
 * C subroutines (%eax, %edx and %ecx), so if you do something weird,
 * you're on your own. The only segments that are saved (not counting the
 * automatic stack and code segment handling) are %ds and %es, and they
 * point to kernel space. No messing around with %fs here.
 */
#define SAVE_MOST \
    "cld\n\t" \
    "push %es\n\t" \
    "push %ds\n\t" \
    "pushl %eax\n\t" \
    "pushl %edx\n\t" \
    "pushl %ecx\n\t" \
    "movl $0x10,%edx\n\t" \
    "mov %dx,%ds\n\t" \
    "mov %dx,%es\n\t"

#define RESTORE_MOST \
    "popl %ecx\n\t" \
    "popl %edx\n\t" \
    "popl %eax\n\t" \
    "pop %ds\n\t" \
    "pop %es\n\t" \
    "iret"

#define ACK_FIRST(mask) \
    "inb $0x21,%al\n\t" \
    "jmp 1f\n" \
    "1:\tjmp 1f\n" \
    "1:\torb $" #mask ",%al\n\t" \
    "outb %al,$0x21\n\t" \
    "jmp 1f\n" \
    "1:\tjmp 1f\n" \
    "1:\tmovb $0x20,%al\n\t" \
    "outb %al,$0x20\n\t"

#define ACK_SECOND(mask) \
    "inb $0xA1,%al\n\t" \
    "jmp 1f\n" \
    "1:\tjmp 1f\n" \
    "1:\torb $" #mask ",%al\n\t" \
    "outb %al,$0xA1\n\t" \
    "jmp 1f\n" \
    "1:\tjmp 1f\n" \
    "1:\tmovb $0x20,%al\n\t" \
    "outb %al,$0xA0\n\t" \
    "jmp 1f\n" \
    "1:\tjmp 1f\n" \
    "1:\toutb %al,$0x20\n\t"

#define UNBLK_FIRST(mask) \
    "inb $0x21,%al\n\t" \
    "jmp 1f\n" \
    "1:\tjmp 1f\n" \
    "1:\tandb $~(" #mask "),%al\n\t" \
    "outb %al,$0x21\n\t"

#define UNBLK_SECOND(mask) \
    "inb $0xA1,%al\n\t" \
    "jmp 1f\n" \
    "1:\tjmp 1f\n" \
    "1:\tandb $~(" #mask "),%al\n\t" \
    "outb %al,$0xA1\n\t"

#define IRQ_NAME2(nr) nr##_interrupt()
#define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
#define FAST_IRQ_NAME(nr) IRQ_NAME2(fast_IRQ##nr)
#define BAD_IRQ_NAME(nr) IRQ_NAME2(bad_IRQ##nr)

#define BUILD_IRQ(chip,nr,mask) \
void IRQ_NAME(nr); \
void FAST_IRQ_NAME(nr); \
void BAD_IRQ_NAME(nr); \
__asm__( \
"\n.align 2\n" \
"_IRQ" #nr "_interrupt:\n\t" \
    "pushl $-1\n\t" \
    SAVE_ALL \
    ACK_##chip(mask) \
    "sti\n\t" \
    "movl %esp,%ebx\n\t" \
    "pushl %ebx\n\t" \
    "pushl $" #nr "\n\t" \
    "call _do_IRQ\n\t" \
    "addl $8,%esp\n\t" \
    "testl %eax,%eax\n\t" \
    "jne ret_from_sys_call\n\t" \
    "cli\n\t" \
    UNBLK_##chip(mask) \
    "jmp ret_from_sys_call\n" \
"\n.align 2\n" \
"_fast_IRQ" #nr "_interrupt:\n\t" \
    SAVE_MOST \
    ACK_##chip(mask) \
    "pushl $" #nr "\n\t" \
    "call _do_fast_IRQ\n\t" \
    "addl $4,%esp\n\t" \
    "testl %eax,%eax\n\t" \
    "jne 2f\n\t" \
    "cli\n\t" \
    UNBLK_##chip(mask) \
    "\n2:\t" \
    RESTORE_MOST \
"\n\n.align 2\n" \
"_bad_IRQ" #nr "_interrupt:\n\t" \
    "pushl %eax\n\t" \
    ACK_##chip(mask) \
    "popl %eax\n\t" \
    "iret");


#endif